JP5622659B2 - Power converter - Google Patents

Description

  The present invention relates to a power conversion device that controls a motor. In particular, the present invention relates to a power conversion device that controls a vehicle driving motor.

  When the power conversion device is highly functional, particularly for driving a vehicle, cooperative control with many external signals is required.

  Patent Document 1 describes a signal and power supply taken into the power converter. However, as the power conversion device is further enhanced in functionality, when coordinated control with many external signals is required, it is necessary to improve the space efficiency of the wiring material and satisfy the needs for downsizing. In addition, when the power conversion device is disposed in a place exposed to severe vibration, it is necessary to consider the influence of vibration on the connector for connecting to an external signal.

JP 2007-159255 A

  The subject of this invention is improving the vibration efficiency while improving the space efficiency of a wiring material and reducing a power converter device.

  In order to solve the above problems, the present invention provides a power module having a switching element for converting a direct current into an alternating current, a control circuit board having a control circuit for controlling driving of the switching operation of the switching element, and an external connector. A connector having a terminal, a first internal connector terminal, and a second internal connector terminal; a first flexible printed circuit board having one end connected to the first internal connector terminal and the other end connected to the control circuit board; and one end Is connected to the second internal connector terminal and the other end is connected to the control circuit board, and stores the control circuit board and the first and second flexible printed boards and the connector. A housing that forms an opening that is closed by the first internal connector terminal and the front The second internal connector terminals are arranged side by side from the upper direction to the lower direction of the casing, and the first flexible printed circuit board is connected to the second flexible printed circuit board from the upper direction to the lower direction of the casing. They are placed one on top of the other.

  According to the present invention, it is possible to reduce the size of the power converter and improve the vibration resistance.

It is a figure which shows the control block of a hybrid vehicle. The external appearance perspective view of the whole structure of the power converter device which concerns on embodiment of this invention. It is the perspective view which decomposed | disassembled the whole structure of the power converter device which concerns on embodiment of this invention into each component. It is sectional drawing (AA sectional reference of FIG. 2) of the power converter device 200. FIG. It is a perspective view which shows the mounting space of the flexible printed circuit board concerning embodiment of this invention. It is sectional drawing of the power converter device at the time of connecting the flexible printed circuit board concerning embodiment of this invention. It is a perspective view which shows the process of connecting the flexible printed circuit board concerning embodiment of this invention. It is a perspective view which shows the process of connecting the flexible printed circuit board concerning embodiment of this invention. It is a perspective view which shows the process of connecting the flexible printed circuit board concerning embodiment of this invention.

  A power converter according to an embodiment of the present invention will be described below in detail with reference to the drawings. The power conversion device according to the embodiment of the present invention can be applied to a hybrid vehicle or a pure electric vehicle. As a representative example, the power conversion device according to the embodiment of the present invention is applied to a hybrid vehicle. The control configuration will be described with reference to FIG. FIG. 1 is a diagram showing a control block of a hybrid vehicle.

  The power conversion device according to the embodiment of the present invention is used in a vehicle-mounted power conversion device for a vehicle-mounted electrical system mounted on an automobile, in particular, a vehicle drive electrical system, and has a very severe mounting environment and operational environment. The inverter device will be described as an example. A vehicle drive inverter device is provided in a vehicle drive electrical system as a control device for controlling the drive of a vehicle drive motor, and a DC power supplied from an onboard battery or an onboard power generator constituting an onboard power source is a predetermined AC power. Then, the AC power obtained is supplied to the vehicle drive motor to control the drive of the vehicle drive motor. Further, since the vehicle drive motor also has a function as a generator, the vehicle drive inverter device also has a function of converting the AC power generated by the vehicle drive motor into DC power according to the operation mode. Yes. The converted DC power is supplied to the on-vehicle battery.

  The configuration of the present embodiment is optimal as a power conversion device for driving a vehicle such as an automobile or a truck. However, other power conversion devices such as a power conversion device such as a train, a ship, and an aircraft, and a factory facility are also included. Applicable to industrial power converters used as drive motor control devices, or household power conversion devices used in home solar power generation systems and motor control devices that drive household appliances It is.

  In FIG. 1, a hybrid electric vehicle (hereinafter referred to as “HEV”) 110 is one electric vehicle and includes two vehicle drive systems. One of them is an engine system that uses an engine 120 that is an internal combustion engine as a power source. The engine system is mainly used as a drive source for HEV. The other is an in-vehicle electric system using motor generators 192 and 194 as a power source. The in-vehicle electric system is mainly used as an HEV drive source and an HEV power generation source. The motor generators 192 and 194 are, for example, synchronous machines or induction machines, and operate as both a motor and a generator depending on the operation method.

  A front wheel axle 114 is rotatably supported at the front portion of the vehicle body. A pair of front wheels 112 are provided at both ends of the front wheel axle 114. A rear wheel axle (not shown) is rotatably supported on the rear portion of the vehicle body. A pair of rear wheels are provided at both ends of the rear wheel axle. The HEV of this embodiment employs a so-called front wheel drive system in which the main wheel driven by power is the front wheel 112 and the driven wheel to be driven is the rear wheel. You may adopt.

  A front wheel side differential gear (hereinafter referred to as “front wheel side DEF”) 116 is provided at the center of the front wheel axle 114. The front wheel axle 114 is mechanically connected to the output side of the front wheel side DEF 116. The output shaft of the transmission 118 is mechanically connected to the input side of the front wheel side DEF 116. The front wheel side DEF 116 is a differential power distribution mechanism that distributes the rotational driving force that is shifted and transmitted by the transmission 118 to the left and right front wheel axles 114. The output side of the motor generator 192 is mechanically connected to the input side of the transmission 118. The output side of the engine 120 and the output side of the motor generator 194 are mechanically connected to the input side of the motor generator 192 via the power distribution mechanism 122. Motor generators 192 and 194 and power distribution mechanism 122 are housed inside the casing of transmission 118.

  The motor generators 192 and 194 are synchronous machines having a permanent magnet on the rotor, and the AC power supplied to the armature windings of the stator is controlled by the inverter devices 140 and 142, thereby the motor generators 192 and 194. Is controlled. A battery 136 is electrically connected to the inverter devices 140 and 142, and power can be exchanged between the battery 136 and the inverter devices 140 and 142.

  In the present embodiment, the first motor generator unit composed of the motor generator 192 and the inverter device 140 and the second motor generator unit composed of the motor generator 194 and the inverter device 142 are provided. ing. That is, in the case where the vehicle is driven by the power from the engine 120, when assisting the driving torque of the vehicle, the second motor generator unit is operated as the power generation unit by the power of the engine 120 to generate power. The first electric power generation unit is operated as an electric unit by the obtained electric power. Further, in the same case, when assisting the vehicle speed of the vehicle, the first motor generator unit is operated by the power of the engine 120 as a power generation unit to generate power, and the second motor generator unit is generated by the electric power obtained by the power generation. Operate as an electric unit.

  In the present embodiment, the vehicle can be driven only by the power of the motor generator 192 by operating the first motor generator unit as an electric unit by the electric power of the battery 136. Furthermore, in the present embodiment, the battery 136 can be charged by generating power by operating the first motor generator unit or the second motor generator unit as the power generation unit by the power of the engine 120 or the power from the wheels.

  The battery 136 is also used as a power source for driving an auxiliary motor 195. The auxiliary machine is, for example, a motor that drives a compressor of an air conditioner or a motor that drives a hydraulic pump for control. DC power is supplied from the battery 136 to the inverter 43 device, and is converted into AC power by the inverter device 43. To the motor 195. The inverter device 43 has the same function as the inverter devices 140 and 142, and controls the phase, frequency, and power of alternating current supplied to the motor 195. For example, the motor 195 generates torque by supplying AC power having a leading phase with respect to the rotation of the rotor of the motor 195. On the other hand, by generating the delayed phase AC power, the motor 195 acts as a generator, and the motor 195 is operated in a regenerative braking state. Such a control function of the inverter device 43 is the same as the control function of the inverter devices 140 and 142. Since the capacity of the motor 195 is smaller than the capacity of the motor generators 192 and 194, the maximum conversion power of the inverter device 43 is smaller than that of the inverter devices 140 and 142, but the circuit configuration of the inverter device 43 is basically the circuit of the inverter devices 140 and 142. Same as the configuration.

  The inverter devices 140 and 142, the inverter device 43, and the capacitor module 500 are in an electrical close relationship. Furthermore, there is a common point that measures against heat generation are necessary. It is also desired to make the volume of the device as small as possible. From these points, the power conversion device described in detail below includes the inverter devices 140 and 142, the inverter device 43, and the capacitor module 500 in the casing of the power conversion device. With this configuration, a small and highly reliable device can be realized.

  Further, by incorporating the inverter devices 140 and 142, the inverter device 43, and the capacitor module 500 in one housing, it is effective in simplifying wiring and taking measures against noise. In addition, the inductance of the connection circuit between the capacitor module 500, the inverter devices 140 and 142, and the inverter device 43 can be reduced, the spike voltage can be reduced, heat generation can be reduced, and heat dissipation efficiency can be improved.

  2 to 4 illustrate the overall configuration of the power conversion device 200. FIG. 10 is an upper case, 11 is a metal base plate, 12 is a housing, 13 is a cooling water inlet pipe, 14 is a cooling water outlet pipe, 420 is a cover, 16 is a lower case, 17 is an AC terminal case, 18 is an AC terminal, Reference numeral 19 is a cooling water flow path, and 20 is a control circuit board which holds the control circuit 172. Reference numeral 21 denotes a connector for connection to the outside, and reference numeral 22 denotes a drive circuit board that holds a driver circuit 174. Two power modules (semiconductor module units) 300 are provided, and an inverter circuit 144 is built in each power module. 700 is a flat laminated bus bar, 800 is an O-ring, 304 is a metal base, 188 is an AC connector, 314 is a DC positive terminal, 316 is a DC negative terminal, 500 is a capacitor module, 502 is a capacitor case, 504 is a positive capacitor terminal, Reference numeral 506 denotes a negative side capacitor terminal, and 514 denotes a capacitor cell.

  FIG. 2: shows the external appearance perspective view of the whole structure of the power converter device which concerns on embodiment of this invention. The external appearance of the power conversion device 200 according to the present embodiment is as follows. The casing 12 whose top surface or bottom surface is substantially rectangular, and the cooling water inlet pipe 13 and the outlet provided on one of the outer circumferences on the short side of the casing 12. The pipe 14, the upper case 10 for closing the upper opening of the housing 12, and the lower case 16 for closing the lower opening of the housing 12 are fixedly formed.

  As shown in FIG. 3, two sets of AC terminal cases 17 for assisting connection with the motor generators 192 and 194 are provided on the outer periphery of the long side of the power conversion device 200. AC terminal 18 electrically connects power module 300 and motor generators 192 and 194, and transmits an AC current output from power module 300 to motor generators 192 and 194.

  The connector 21 is connected to a control circuit board 20 built in the housing 12 and transmits various external signals to the control circuit board 20. The direct current (battery) negative electrode side connection terminal portion 510 and the direct current (battery) positive electrode side connection terminal portion 512 electrically connect the battery 136 and the capacitor module 500. Here, in the present embodiment, the connector 21 is provided on one side of the outer peripheral surface on the short side of the housing 12. On the other hand, the direct current (battery) negative electrode side connection terminal portion 510 and the direct current (battery) positive electrode side connection terminal portion 512 are provided on the outer peripheral surface on the short side opposite to the surface on which the connector 21 is provided. That is, the connector 21 and the direct current (battery) negative electrode side connection terminal portion 510 are arranged apart from each other. As a result, noise that enters the housing 12 from the direct current (battery) negative electrode side connection terminal portion 510 and further propagates to the connector 21 can be reduced, and the controllability of the motor by the control circuit board 20 can be improved. .

  FIG. 3 is a perspective view in which the entire configuration of the power conversion device 200 according to the embodiment of the present invention is disassembled into each component.

  As shown in FIG. 3, a cooling water flow path 19 is provided in the middle of the housing 12, and two sets of openings 400 and 402 are formed in the upper part of the cooling water flow path 19 side by side in the flow direction. . Two power modules 300 are fixed so that the two sets of openings 400 and 402 are respectively closed by the power module 300. Each power module 300 is provided with fins 305 for radiating heat, and the fins 305 of each power module 300 protrude into the cooling water flow from the openings 400 and 402 of the cooling water channel 19, respectively.

An opening 404 for facilitating aluminum casting is formed below the cooling water channel 19, and the opening 404 is closed by a cover 420. An auxiliary inverter device 43 is attached to the lower side of the cooling water passage 19. The inverter device 43 is fixed to the lower surface of the cooling water channel 19 so that the heat radiating metal surface of the built-in power module faces the lower surface of the cooling water channel 19. Further, an O-ring 800 for sealing is provided between the power module 300 and the housing 12, and an O-ring 802 is also provided between the cover 420 and the housing 12. In this embodiment, the sealing material is an O-ring, but a resin material, liquid seal, packing, or the like may be used instead of the O-ring. Can be improved.
In addition, a lower case 16 is provided in the lower part of the cooling water flow path 19 so as to dissipate heat. It is fixed to the surface of the lower case 16 so as to face the surface. With this structure, cooling can be efficiently performed using the upper surface and the lower surface of the cooling water channel 19, which leads to downsizing of the entire power conversion device.

  When the cooling water from the cooling water inlet / outlet pipes 13 and 14 flows through the cooling water flow path 19, the heat radiation fins of the two power modules 300 provided side by side are cooled, and the entire two power modules 300 are cooled. Is done. The auxiliary inverter device 43 provided on the lower surface of the cooling water passage 19 is also cooled at the same time.

  Further, the casing 12 provided with the cooling water flow path 19 is cooled, whereby the lower case 16 provided at the lower portion of the casing 12 is cooled, and by this cooling, the heat of the capacitor module 500 is transferred to the lower case 16 and the casing. The capacitor module 500 is cooled by being thermally conducted to the cooling water through the body 12.

  Above the power module 300, a laminated conductor plate 700 for electrically connecting the power module 300 and the capacitor module 500 is disposed. The laminated conductor plate 700 is configured to be wide in the width direction of the two power modules 300 across the two power modules 300. Furthermore, the laminated conductor plate 700 includes a positive electrode side conductor plate 702 connected to the positive electrode side terminal of the capacitor module 500, a negative electrode side conductor plate 704 connected to the negative electrode side terminal, the positive electrode side terminal and the negative electrode side terminal. It is comprised by the insulating member arrange | positioned between. As a result, the laminated area of the laminated conductor plate 700 can be increased, so that the parasitic inductance from the power module 300 to the capacitor module 500 can be reduced. In addition, after placing one laminated conductor plate 700 on the two power modules 300, the laminated conductor plate 700, the power module 300, and the capacitor module 500 can be electrically connected. Even if it is a power converter provided, the assembly man-hour can be suppressed.

  A control circuit board 20 and a drive circuit board 22 are disposed above the laminated conductor plate 700. Further, a metal base plate 11 is disposed between the drive circuit board 22 and the control circuit board 20, and the metal base plate 11 functions as an electromagnetic shield for a circuit group mounted on both the boards 22 and 20, and also the drive circuit board. The heat generated by the control circuit board 20 and the control circuit board 20 is released and cooled. In this way, the cooling water flow path 19 is provided in the central portion of the housing 19, the power module 300 for driving the vehicle is arranged on one side thereof, and the power module 43 for auxiliary machines is arranged on the other side. Thus, cooling can be efficiently performed in a small space, and the entire power conversion device can be downsized. Further, by making the main structure of the cooling water channel 19 at the center of the casing by casting an aluminum material integrally with the casing 12, the cooling water channel 19 has the effect of increasing the mechanical strength in addition to the cooling effect. Further, by making the aluminum casting, the housing 12 and the cooling water flow path 19 are integrated with each other, heat conduction is improved, and cooling efficiency is improved.

  FIG. 4 is a cross-sectional view of the power conversion device 200 (A-A cross-sectional reference in FIG. 2), and the basic structure is as already described.

  A cooling water passage 19 (dotted line portion in FIG. 4) made of aluminum die casting is provided integrally with the housing 12 at the center in the vertical direction in the cross section of the housing 12, and is formed on the upper surface side of the cooling water passage 19. The power module 300 (the chain line portion in FIG. 4) is installed in the opened opening. The left side with respect to the paper surface of FIG. 4 is the outgoing path 19a on the cooling water side, and the right side with respect to the paper surface is the return path 19b on the return side of the water channel. As described above, the forward path 19a and the return path 19b are each provided with an opening, and the opening is blocked by the metal base 304 for heat dissipation of the power module 300 so as to straddle both the forward path 19a and the return path 19b. Fins 305 for heat dissipation provided in 304 protrude from the opening in the flow of cooling water. In addition, an auxiliary inverter device 43 is fixed to the lower surface side of the cooling water passage 19.

  One end of the plate-like AC power line 186 bent substantially at the center is connected to the AC terminal 159 of the power module 300, and the other end protrudes from the power converter 200 to form an AC connector. The positive electrode side capacitor terminal 504 and the negative electrode side capacitor terminal 506 are electrically and mechanically connected to the positive electrode side conductor plate 702 and the negative electrode side conductor plate 704 through the through holes 406 (two-dot chain line portion in FIG. 4), respectively. The A cooling water flow path 19 that reciprocates substantially in the center of the casing 12 in the direction of the long side of the rectangle is disposed, and the AC terminal 18, the positive-side capacitor terminal 504, and the negative-side capacitor terminal are arranged in a direction substantially perpendicular to the cooling water flow direction. 506 is arranged. Therefore, the electrical wiring is arranged in an orderly manner, which leads to a reduction in size of the power conversion device 200. Since the positive electrode side conductor plate 702 and the negative electrode side conductor plate 704 of the laminated conductor plate 700 and the AC side power line 186 project outside the power module 300 to form connection terminals, the structure is very simple, and other connection conductors are provided. Because it is not used, it is downsized. This structure improves productivity and improves reliability.

  Further, the through hole 406 is separated from the cooling water flow path 19 by a frame inside the housing 12, and the positive electrode side conductor plate 702 and the negative electrode side conductor plate 704, the positive electrode side capacitor terminal 506, and the negative electrode side capacitor terminal 504. Therefore, the reliability is improved.

  The power module 300 having a large calorific value is fixed to one surface of the cooling water channel 19 and the fins 305 of the power module 300 protrude from the opening of the cooling water channel 19 into the water channel for efficient cooling. The auxiliary inverter device 43 having a large amount of heat is cooled on the other surface of the cooling water flow path 19, and the capacitor module 500 having the next largest heat generation amount is cooled via the housing 12 and the lower case 16. Thus, since it is set as the cooling structure match | combined with much heat dissipation, while cooling efficiency and reliability improve, the power converter device 200 can be reduced more in size.

  Further, since the auxiliary inverter device 43 is fixed to the side of the capacitor module 500 of the cooling water passage 19, the capacitor module 500 can be used as a smoothing capacitor of the auxiliary inverter device 43. In this case, the wiring distance is shortened. There is. In addition, since the wiring distance is short, the inductance can be reduced.

  Also on the drive circuit board 22, a control circuit board 20 is disposed above the drive circuit board 22 with a metal base plate 11 for enhancing the effects of heat dissipation and electromagnetic shielding interposed therebetween. By fixing the upper case 10 to the housing 12, the power conversion device 200 according to the present embodiment is configured.

  As described above, since the drive circuit board 22 is arranged between the control circuit board 20 and the power module 300, the operation timing of the inverter circuit is transmitted from the control circuit board 20 to the drive circuit board 22, and based on that. A gate signal is generated by the drive circuit board 22 and applied to each gate of the power module 300. Since the control circuit board 20 and the drive circuit board 22 are thus arranged along the electrical connection relationship, the electrical wiring can be simplified and the power converter 200 can be downsized. The drive circuit board 22 is disposed at a distance closer to the control circuit board 20 than the power module 300 and the capacitor module 500. Therefore, the wiring distance from the drive circuit board 22 to the control circuit board 20 is shorter than the wiring distance between other components (such as the power module 300) and the control circuit board 20. Therefore, electromagnetic noise transmitted from the DC positive electrode side connection terminal portion 512 and electromagnetic noise due to the switching operation of the IGBTs 328 and 330 can be prevented from entering the wiring from the drive circuit board 22 to the control circuit board 20.

  The power module 300 is fixed to one surface of the cooling water channel 19 and the auxiliary inverter device 43 is fixed to the other surface, so that the power module 300 and the auxiliary inverter device 43 are simultaneously cooled by the cooling water channel 19. To do. In this case, the power module 300 has a greater cooling effect because the fins for heat dissipation are in direct contact with the cooling water in the cooling water passage 19. Further, the casing 12 is cooled by the cooling water flow path 19, and the lower case 16 and the metal base plate 11 are fixed to the casing 12, thereby cooling through the lower case 16 and the metal base plate 11. Since the metal case of the capacitor module 500 is fixed to the lower case 16, the capacitor module 500 is cooled via the lower case 16 and the housing 12. Further, the control circuit board 20 and the drive circuit board 22 are cooled via the metal base plate 11. Further, the lower case 16 is also made of a material having good thermal conductivity, receives heat generated from the capacitor module 500, conducts heat to the housing 19, and is radiated by the cooling water in the cooling water passage 19. In addition, on the other side of the cooling water passage 19 that is the lower cover 15 side, an inverter device 43 for auxiliary equipment having a relatively small capacity, which is used for an air conditioner for a vehicle, an oil pump, and a pump for other purposes, is installed. The heat generated from the auxiliary inverter device 43 is radiated by the cooling water in the cooling water passage 19 through the intermediate frame of the housing 12. In this way, the cooling water flow path 19 is provided in the center, the metal base plate 11 is provided on one side, and the lower case 16 is provided on the other side. It can cool well. Also, the components are neatly arranged inside the power conversion device 200, and the size can be reduced.

  The heat radiator that performs the heat dissipation function of the power conversion device is primarily the cooling water flow path 19, but the metal base plate 11 also performs this function (the metal base plate 11 is used to perform the heat dissipation function). Provided). The metal base plate 11 performs an electromagnetic shielding function, receives heat from the control circuit board 20 and the drive circuit board 22, conducts heat to the housing 12, and is radiated by the cooling water in the cooling water flow path 19.

  As described above, the power converter according to the present embodiment has a multilayer structure in which the radiator is a three-layered structure, that is, the metal base plate 11, the cooling water channel 19, and the lower case 16, and these The heat radiators are hierarchically installed adjacent to the respective heat generators (power module 300, control circuit board 20, drive circuit board 22, and capacitor module 500). In the center of the hierarchical structure, there is a cooling water flow path 19 that is a main radiator, and the metal base plate 11 and the lower case 16 are structured to transmit heat to the cooling water in the cooling water flow path 19 through the housing 12. . Three heat radiators (cooling water flow path 19, metal base plate 11, lower case 16) are accommodated in the housing 12 to improve heat dissipation and contribute to reduction in thickness and size.

  FIG. 5 is a perspective view showing a mounting space of the flexible printed circuit board according to the embodiment of the present invention. The housing 12 forms an opening 1201 into which the connector 21 is inserted, and is provided with a space 1202 for accommodating a flexible printed board described later. Conventionally, this space 1202 is a space for storing the wiring material according to the number of signals to be handled, so that a considerable space is required.

  FIG. 6 is a cross-sectional view of the power conversion device 200 of FIG.

  The connector 21 includes an external connector terminal 21a that is electrically connected to the signal harness, and a first internal connector terminal 21b and a second internal connector terminal 21c that are disposed on the housing space side of the housing 12. The first internal connector terminal 21b and the second internal connector terminal 21c are arranged side by side from the upper direction of the housing 12 to the lower direction.

  The first flexible printed board 2102 has one end connected to the first internal connector terminal 21 b and the other end connected to the control circuit board 20. The second flexible printed board 2101 has one end connected to the second internal connector terminal 21 c and the other end connected to the control circuit board 20.

  The first flexible printed circuit board 2102 is arranged so as to overlap the second flexible printed circuit board 2101 from the upper direction to the lower direction of the housing 12.

  Thereby, when a flexible printed circuit board expands greatly in the width direction of the housing | casing 12, it can suppress that a power converter device enlarges. In addition, since the connector aspect ratio can be reduced by reducing the width direction of the connector 21, the connector 21 can cope with vibrations such as when the power conversion device 200 is mounted on a vehicle with a small number of fixed points. Become.

  In addition, the drive circuit board 22 is disposed on the power module 300 illustrated in FIG. 4, and the control circuit board 20 is disposed on the drive circuit board 22. As illustrated in FIG. 5, the housing 12 is formed with an opening 1201 into which the connector 21 is inserted in a side wall that forms a height direction from the lower portion to the upper portion of the housing 12. The opening 1201 is formed at a position lower than the control circuit board 20.

  The control circuit board 20 that needs to be protected from electromagnetic noise generated from the drive circuit board 22 and the power module 300 is arranged on the upper part of the power conversion device in order to be separated from the power module 300. On the other hand, since an opening for inserting the power module 300, the drive circuit board 22, and the control circuit board 20 into the housing 12 is formed on the upper surface of the power converter 200, the inlet pipe 13, the outlet pipe 14, and the control signal Connector 21 is disposed on the side surface of power conversion device 200. Even if it becomes such arrangement | positioning relationship, noise suppression and size reduction of a power converter device can be aimed at, and an assembly property can be improved.

  The housing 12 has a metal partition 12 a disposed in a space between the drive circuit board 22 and the connector 21. Thereby, the connector 21 can be protected from electromagnetic noise radiated from the drive circuit board 22, and the degree of freedom of arrangement of the connector 21 is increased, so that the power converter can be downsized.

  Further, the partition wall 12 a protrudes from the housing 12, and the tip of the partition wall 12 a contacts the metal base plate 11. Thereby, the electromagnetic noise propagated to the metal base plate 11 can be dropped to the ground of the housing 12 via the partition wall 12a.

  FIG. 7A to FIG. 7C are perspective views showing a process of connecting the first flexible printed board 2102 and the second flexible printed board 2101 to the control circuit board 20.

  As shown in FIGS. 7A to 7C, the first flexible printed circuit board 2102 has a flexible printed circuit board side connector 2110a at the front end, and the second flexible printed circuit board 2101 has a flexible printed circuit at the front end. A board-side connector 2110b is provided.

  On the other hand, the control circuit board 20 has a first board side connector 2001a connected to the flexible printed board side connector 2110a and a second board side connector 2001b connected to the flexible printed board side connector 2110b on the upper surface side. Have. The second board side connector 2001b is disposed closer to the first flexible printed board 2102 and the edge 20a of the control circuit board 20 closest to the second flexible printed board 2101 than the first board side connector 2001a. Further, the first flexible printed board 2102 is connected to the first board side connector 2001a across the connecting portion between the flexible printed board side connector 2110b and the second board side connector 2001b.

  As shown in FIG. 7B, the second flexible printed board 2101 as the lower layer is first connected to the second board side connector 2001b. Thereafter, as shown in FIG. 7C, the upper first flexible printed circuit board 2102 is connected to the first circuit board connector 2001a. By preparing this arrangement several times, it is possible to give flexibility to the width of the flexible printed circuit board, and at the same time, it is possible to reliably transmit many external signals into the power converter. Further, the connection between the flexible printed circuit board and the control circuit board 20 is performed from the upper surface where the opening of the housing 12 is formed, and the assemblability can be easily maintained.

12 Housing 12a Bulkhead 20 Control circuit board 20a Edge 21 Connector 21a External connector terminal 21b First internal connector terminal 21c Second internal connector terminal 1201 Opening 1202 Space 2001a First board side connector 2001b Second board side connector 2101 Second Flexible printed circuit board 2102 First flexible printed circuit board 2110a, 2110b Flexible printed circuit board side connector

Claims (4)

A power module having a switching element for converting a direct current into an alternating current;
A control circuit board having a control circuit for controlling driving of the switching operation of the switching element;
A connector having an external connector terminal, a first internal connector terminal, and a second internal connector terminal;
A first flexible printed circuit board having one end connected to the first internal connector terminal and the other end connected to the control circuit board;
A second flexible printed circuit board having one end connected to the second internal connector terminal and the other end connected to the control circuit board;
A housing for housing the control circuit board and the first and second flexible printed boards and forming an opening closed by the connector;
The first internal connector terminal and the second internal connector terminal are arranged side by side along the lower direction from the upper direction of the housing,
The first flexible printed circuit board is disposed so as to overlap the second flexible printed circuit board from the upper direction to the lower direction of the housing ,
A drive circuit board having a drive circuit for driving a switching operation of the switching element;
The drive circuit board is disposed on the power module,
Furthermore, the control circuit board is disposed on the drive circuit board,
The housing forms an opening which is closed by a lid on the upper surface,
The opening that is closed by the connector of the housing is a side wall that forms a height direction from the lower part to the upper part, and is formed at a position lower than the control circuit board,
Comprising power conversion device a metal partition wall disposed in the space between the connector and the driving circuit board. The power conversion device according to claim 1,
  A metal base plate disposed in a space between the drive circuit board and the control circuit board;
  The casing is made of an electrically conductive member,
  The metal base plate is a power conversion device supported by the housing. The power conversion device according to claim 1,
  The partition wall projects from the housing, and a tip of the partition wall is in contact with the metal base plate. The power conversion device according to any one of claims 1 to 3,
  The control circuit board has a first board side connector connected to the first flexible printed board and a second board side connector connected to the second flexible printed board on the upper surface side thereof,
  The second board side connector is disposed closer to the end of the control circuit board closest to the first and second flexible printed boards than the first board side connector,
  The first flexible printed board is a power conversion device connected to the first board side connector across a connection portion between the second flexible printed board and the second board side connector.

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